hadith 2243 ۞ 447. Amīr al-mu’minīn, peace be upon him, said: Whoever trades without knowing the rules of religious law will be involved in usury. ٤٤٧. وَقَالَ (عليه السلام): مَنِ اتَّجَرَ بِغَيْرِ فِقْهٍ فَقَدِ ارْتَطَمَ فِي الرِّبَا.